Nigel Da Costa Lewis. Applied Statistical Methods for Risk Management

Preface xiii.
Acknowledgments xv.
Chapter.
Introduction to Operational Risk management and modeling.
What is Operational Risk?
The Regulatory Environment.
Why a statistical Approach to Operational Risk management?
Summary.
Review Questions.
Further Reading.
Chapter.
Random Variables, Risk indicators, and Probability.
Random Variables and Operational Risk Indicators.
Types of Random Variable.
Probability.
Frequency and subjective Probability.
Probability Functions.
Case studies.
Case study 2.1: downtown Investment Bank.
Case study 2.2: mr. mondey’s OpvaR.
Case study 2.3: Risk in software development.
Useful Excel Functions.
Summary.
Review Questions.
Further Reading.
viiChapter.
Expectation, Covariance, Variance, and Correlation.
Expected Value of a RandomVariable.
Variance and standard deviation.
Covariance and Correlation.
Some Rules for Correlation, Variance, and Covariance.
Case studies.
Case study 3.1: Expected Time to Complete.
a Complex Transaction.
Case study 3.2: Operational Cost of system down Time.
Summary.
Review Questions.
Further Reading.
Chapter.
Modeling Central Tendency and Variability of Operational Risk Indicators.
Empirical measures of Central Tendency.
Measures of Variability.
Case studies.
Case study 4.1: Approximating Business Risk.
Excel Functions.
Summary.
Review Questions.
Further Reading.
Chapter.
Measuring skew and Fat Tails of Operational Risk Indicators.
Measuring skew.
Measuring Fat Tails.
Review of Excel and Vba functions for skew and Fat Tails.
Summary.
Review Questions.
Further Reading.
Chapter.
Statistical Testing of Operational Risk Parameters.
Objective and LanguagLanguage of statistical Hypothesis Testing.
Steps Involved In Conducting a Hypothesis Test.
Confidence Intervals.
Case study 6.1: stephan’s mistake.
Excel Functions for Hypothesis Testing.
Summary.
Review Questions.
Further Reading.
Chapter.
Severity of Loss Probability models.
Normal distribution.
Estimation of Parameters.
Beta distribution.
Erlang distribution.
Exponential distribution.
Gamma distribution.
Lognormal distribution.
Pareto distribution.
Weibull distribution.
Other Probability distributions.
What distribution Best Fits my Severity of Loss data?
Case Study 7.1: modeling Severity of Loss Legal.
Liability Losses.
Summary.
Review Questions.
Further Reading.
Chapter.
Frequency of Loss Probability Models.
Popular Frequency of Loss Probability Models.
Other Frequency of Loss distributions.
Chi-Squared Goodness of Fit Test.
Case Study 8.1: Key Personnel Risk.
Summary.
Review Questions.
Further Reading.
Chapter.
Modeling Aggregate Loss distrdistributions.
Aggregating Severity of Loss and Frequency.
of Loss distributions.
Calculating OpVaR.
Coherent Risk Measures.
Summary.
Review Questions.
Further Reading.
Chapter.
The Law of Significant digits and Fraud Risk Identification.
The Law of Significant digits.
Benford’s Law in Finance.
Case Study 10.1: Analysis of Trader’s Profit and Loss.
Using Benford’s Law.
A Step Towards Better Statistical Methods of Fraud detection.
Summary.
Review Questions.
Further Reading.
Chapter.
Correlation and dependence.
Measuring Correlation.
dependence.
Stochastic dependence.
Summary.
Review Questions.
Further Reading.
Chapter.
Linear Regression in Operational Risk Management.
The Simple Linear Regression Model.
Multiple Regression.
Prediction.
Polynomial and Other Types of Regression.
Multivariate Multiple Regression.
Regime-Switching Regression.
The difference Between Correlation and Regression.
A Strategy for Regression Model Building.
in Operational Risk Management.
Summary.
Review Questions.
Further Reading.
Chapter.
Logistic Regression in Operational Risk Management.
Binary Logistic Regression.
Bivariate Logistic RegressionCase Study 13.1: Nostro Breaks and Volume.
in a Bivariate Logistic Regression.
Other Approaches for Modeling Bivariate Binary Endpoints.
Summary.
Review Questions.
Further Reading.
Chapter.
Mixed dependent Variable Modeling.
A Model for Mixed dependent Variables.
Working Assumption of Independence.
Understanding the Benefits of Using a Wai.
Case Study 14.1: Modeling Failure in Compliance.
Summary.
Review Questions.
Further Reading.
Chapter.
Validating Operational Risk Proxies Using Surrogate Endpoints.
The Need for Surrogate Endpoints in Or modeling.
The Prentice Criterion.
Limitations of the Prentice Criterion.
The Real Value Added of Using Surrogate Variables.
Validation Via the Proportion Explained.
Limitations of Surrogate Modelling in Operational.
Risk Management.
Case Study 15.1: Legal Experience as a Surrogate Endpoint.
for Legal Costs for a Business Unit.
Summary.
Review Questions.
Further Reading.
Chapter.
Introduction to Extreme Value Theory.
Fisher-Tippet–Gnedenko Theorem.
Method of Block Maxima.
Peaks over Threshold Modeling.
Summary.
Review Questions.
Further Reading.
Chapter.
Managing Operational Risk with Bayesian Belief NetwNetworks.
What is a Bayesian Belief Network?
Case Study 17.1: A bbn model for Software Product Risk.
Creating a Bbn-Based Simulation.
Assessing the Impact of Different Managerial Strategies.
Perceived Benefits of Bayesian Belief Network Modeling.
Common Myths About Bbns—.
The Truth for Operational Risk Management.
Summary.
Review Questions.
Further Reading.
Chapter.
Epilogue.
Winning the Operational Risk Argument.
Final Tips on Applied Operational Risk Modeling.
Further Reading.
Appendix.
Statistical Tables.
Cumulative Distribution Function of the Standard.
Normal Distribution.
Chi-Squared Distribution.
Student’s t Distribution.
F Distribution.
Notes.
Bibliography.
About the CD-Rom.
Index.